MCP + A2A Enterprise HR Demo

A hands-on project to practice Model Context Protocol (MCP) and basic Agent-to-Agent (A2A) communication using a mock Enterprise HR system.

What I Built

1. MCP Server

Created an Enterprise HR MCP server exposing tools for:

• Employee information

• Leave balance

• Support tickets

• Product inventory

The tools were tested successfully using the MCP Inspector and MCP client.

2. AI Agent + MCP

Connected a Groq LLM to the MCP client.

The LLM:

1. Receives the user request.

2. Discovers the available MCP tools.

3. Selects the appropriate tool.

4. Generates the required arguments.

5. Calls the MCP tool.

6. Receives the result.

Example:

User
 ↓
Groq LLM
 ↓
get_leave_balance
 ↓
MCP Client
 ↓
HR MCP Server
 ↓
Leave Balance

3. A2A Communication

Added an Escalation Agent to the primary agent.

The LLM can decide whether a request should:

• Use an MCP tool, or

• Be sent to the Escalation Agent.

Example:

User
 ↓
Primary Agent + LLM
 ↓
Decision
 ├── MCP Tool → HR MCP Server
 │
 └── A2A → Escalation Agent
             ↓
          Response
             ↓
       Primary Agent

Related MCP server: Joule HR MCP Server

Main Goal

This project was built as a hands-on practice project to understand:

• MCP servers

• MCP tools

• MCP clients

• Tool discovery

• LLM tool calling

• A2A agent communication

• How MCP and A2A can work together